Casing head



Patented June 14, 1932 v ALEXANDER BOYNTON, 0F SAN ANTONIO, TEXAS CASINGHEAD Application led November 23, 1927. Serial No. 235,310.

This invention relates to improvements in casing heads and it consistsof the constructions, mode of operation and advantages herein describedand claimed.

5 An object of the invention is to provide means in a casing head forensuring a'iuidtight joint between the parts of the casing headstructure, the variously modified arrangement by which this object isobtained being fully developed below.

Other objects and advantages appear 1 the following specification,reference being had to the accompanying drawing, in which;

Figure 1 is a vertical section of a casing lf head constructed inagreement with the foregoing object,

Fig. 2 is a fragmentary sectional view illustrating the details of Fig.1,

Fig. 3 is a fragmentary sectional view illustrating the use of metallicpacking rings at the various contacting surfaces,

Fig. 4 is a detail plan view of head in Fig. 1.

The present invention is one of a series of improvements in casingheads, the specific purpose of these improvements being to make aneffective yet simple joint between various parts of the casing head sothat none of the iuid in the well casing, usually at high pres- :zosure, escapes. Several modifications are involved herein, andcorresponding parts are identified by similar reference characters.

In the drawing 1 designates the main body of the casing head, 2 thecarrier of the tubing string 3 and 4 the pressure or locking sleeve. Themain body 1 is attached to the casing string 5 by threads indicated at17. Screw threads 6 provide for the attachment of the locking sleeve tothe main body and make :o possible the imposition of great pressure uponthe tubing carrier.

In order to effectually utilize the desired pressure after the means foracquiring it has been devised, the main body 1 is enlarged at 7 4i todefine a base upon which the tubing carrier 2 may rest. A portion of thebase is surfaced at 8 to provide a seat, and upon this seat is laid aground copper or other gasket 9 with which the tubing carrier 2 hasactual 50 contact.

the casing Vrier member is The bottom portion of flanged tubing carmadestraight on the under side and inclined at 11 on the upper side. Anappropriately formed circular flange or projection 12 on' the under sideof the pressure sleeve 4 engages the inclined surface 11 for .theobvious purpose of pressing the flange 10 into tight engagement with thegasket. 1n practice it may be deemed expedient to lubricate thecontactingl surfaces of the flanges 10 and 12 and to t is end theopening 13 in the sleeve 4 is made somewhat larger than the upwardprojection of the tubing carrier which it surrounds so that thelubricant may be supplied from an oil can. v

Fi 2 merely illustrates the details of Fig. 1 to etter advantage.- Therelationship of the various parts is readily seen. The reader can easilyunderstand that screwing or turning the pressure sleeve 4 inthe properdirec- 7 tion will result in a tight application of the rim of theflange 10 to the gasket 9 and of the gasket to the seat 8 of the base 7.It is at this point that the joint is made in sufficiently tightengagement of the various parts to eectually seal the casing headagainst the escape of internal pressure fluid.

1n Fig. 3 the arrangement is somewhat dierent, in that copper, or otherpacking rings 14 and 15 are made use of. The ring 14 replaces the gasket9, and the rin 15 takes up the friction formerly distributed between thecontacting surfaces of the flanges 10 and 12. It is t0 be observed thatthe adjoining surfaces of the seat 8 and flanges #10 and 12 are madeconcave in order to more readily receive the packing rings andI holdthem in the desired position. Itis evident that turning of the pressuresleeve 4 in the proper direction, will produce a compression of eachring so that fluid-tight seals are made.

Fig. 4 discloses a feature quite common to all of the modifications ofthe present series of casing heads. Trunnons 16 in practice, areprovided with openings through which either gas under pressure may beintroduced, or through which the liquid of the well may be discharged.These trunnions are usually made integrally with the main body 1 and oneof the aforementioned openings is indicated by dotted circle in Fig.

I c1aim:- 1. A casing head comprising a main body o having a seat, acarrier for the tubing string of a Well having a flange with an inclinedupper side, a pressure sleeve threaded upon the main body, and acircular projecting liange on the sleeve having a correspondinglyinclined contacting surface engaging the inclined upper side of thecarrier for urging the carrier iange toward the seat.

2. A'easing head comprising a main body,

a carrier seated on the main body, a pres- ;5 sure sleeve secured to themain body having an opening larger than a portion of the carrier whichis received by the opening, said opening admitting a lubricant, and acircular fiange depending from the pressure sleeve, y.) bearing on thecarrier and defining a compartment by which the lubricant is received.3. A casing head comprising a main body having an enlarged portiondefining a base, said base being annularly recessed to provide im aseat, a carrier having a iange fitted in the recess, the underside ofthe iiange being level to engage the seat, the upper side of the flangebeing inclined, a pressure sleeve screwed on said base and having anopening larger than a protruding portion of said carriera, anda circularflange depending from the pressure sleeve bearing on the inclinedsurface of the carrier flange and defining with said flange` an internalcompartment for the reception of lubricant from said opening.

Signed at San Antonio in the county of Bexar and State of Texas this28th'day of October', A. D. 1927.

ALEXANDER BOYNTON.

